The information was released by a developer from another studio
There hasn't been much chatter about the Linux version of Counter-Strike: Global Offensive, but it seems that another developer has spilled the beans about this subject.Valve announced a while back that they intend to port their entire catalog of games to Linux, but they didn't provide a schedule or any other information.
Counter-Strike: Global Offensive is the only Counter-Strike game that hasn't made it to Linux. The game is based on the Half-Life 2 Source engine and it proves to be more resilient than previously anticipated.
In a Linux support question about a completely different game, INSURGENCY, one of their developers, has offered an interesting piece of info.
“We are waiting for Valve to release CSGO on Linux before we will get the code we need to get started on this,” stated the developer.
This is the first confirmation about a Linux port for Counter-Strike: Global Offensive and we can only hope that Valve will manage to finish it soon.